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Can you check if following code is thread-safe?

Pragya Keshap answered on February 4, 2023 Popularity 2/10 Helpfulness 1/10

answer Can you check if following code is thread-safe?

Can you check if following code is thread-safe?

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public class SingletonDoubleCheck {
private SingletonDoubleCheck instance = null;
public SingletonDoubleCheck getInstance() {
if (instance == null) {
synchronized (SingletonDoubleCheck.class) {
if (instance == null) {
instance = new SingletonDoubleCheck();
}
}
}
return instance;
}
}
The above-mentioned code is for creating a Singleton class. But this
code is not thread-safe.
In this we check the value of instance second time in the
synchronized block. But the JIT compiler can rearrange the
Bytecode in such a way that the reference to SingletonDoubleCheck
instance will be set before the execution of constructor.
Due to this the method getInstance() will return an object that may
not have been initialized properly.
We can use the keyword volatile for instance to make this threadsafe code.
Any variables that is marked as volatile will be visible to other
threads only after the completion of the constructor of the object

Popularity 2/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Can you check if following code is thread-safe?

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Can you check if following code is thread-safe?

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